Sasmal Himadri Sekhar, Aiyappa Harshitha Barike, Bhange Siddheshwar N, Karak Suvendu, Halder Arjun, Kurungot Sreekumar, Banerjee Rahul
Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER), Kolkata, Mohanpur Campus, Mohanpur, 741252, India.
Academy of Scientific and Innovative Research (AcSIR), Physical/Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr. HomiBhabha Road, Pune-, 411008, India.
Angew Chem Int Ed Engl. 2018 Aug 20;57(34):10894-10898. doi: 10.1002/anie.201804753. Epub 2018 Jul 19.
Poor mechanical stability of the polymer electrolyte membranes remains one of the bottlenecks towards improving the performance of the proton exchange membrane (PEM) fuel cells. The present work proposes a unique way to utilize crystalline covalent organic frameworks (COFs) as a self-standing, highly flexible membrane to further boost the mechanical stability of the material without compromising its innate structural characteristics. The as-synthesized p-toluene sulfonic acid loaded COF membranes (COFMs) show the highest proton conductivity (as high as 7.8×10 S cm ) amongst all crystalline porous organic polymeric materials reported to date, and were tested under real PEM operating conditions to ascertain their practical utilization as proton exchange membranes. Attainment of 24 mW cm power density, which is the highest among COFs and MOFs, highlights the possibility of using a COF membrane over the other state-of-the-art crystalline porous polymeric materials reported to date.
聚合物电解质膜较差的机械稳定性仍然是提高质子交换膜（PEM）燃料电池性能的瓶颈之一。目前的工作提出了一种独特的方法，即利用结晶共价有机框架（COF）作为自立式、高柔韧性的膜，以在不损害其固有结构特征的情况下进一步提高材料的机械稳定性。所合成的负载对甲苯磺酸的COF膜（COFM）在迄今为止报道的所有结晶多孔有机聚合物材料中显示出最高的质子传导率（高达7.8×10⁻² S cm⁻¹），并在实际的PEM操作条件下进行了测试，以确定它们作为质子交换膜的实际用途。实现了24 mW cm⁻²的功率密度，这在COF和MOF中是最高的，突出了使用COF膜优于迄今为止报道的其他先进结晶多孔聚合物材料的可能性。
